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Using ReactJS with TypeScript

ReactJS component written in TypeScript


Actually you can use ReactJS's components in Typescript as in facebook's example. Just replace 'jsx' file's extension to 'tsx':

//helloMessage.tsx:
var HelloMessage = React.createClass({
 render: function() {
 return <div>Hello {this.props.name}</div>;
 }
});
ReactDOM.render(<HelloMessage name="John" />, mountNode);

But in order to make full use of Typescript's main feature (static type checking) should be done couple things:

1) convert React.createClass example to ES6 Class:


//helloMessage.tsx:
class HelloMessage extends React.Component {
 render() {
 return <div>Hello {this.props.name}</div>;
 }
}
ReactDOM.render(<HelloMessage name="John" />, mountNode);

2) next add Props and State interfaces:


interface IHelloMessageProps {
 name:string;
}
interface IHelloMessageState {
 //empty in our case
}
class HelloMessage extends React.Component<IHelloMessageProps, IHelloMessageState> {
 constructor(){
 super();
 }
 render() {
 return <div>Hello {this.props.name}</div>;
 }
}
ReactDOM.render(<HelloMessage name="Sebastian" />, mountNode);

Now Typescript will display an error if the programmer forgets to pass props. Or if they added props that are not defined in the interface.

Conclusion

In this page (written and validated by ) you learned about React with TypeScript . What's Next? If you are interested in completing React tutorial, your next topic will be learning about: React Installation and Setup.



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